Where does a acacia tree live?

There are roughly 1300 types of Acacia worldwide. 960 of them native to Australia with the others found in Africa, southern Asia and the Americas.

The African acacia was the first to be described.

Aside: Acacias have a bitter and psychoactive sap. When the leaves of the tree are exposed to the spray of acacia sap from other leaves being eaten they get even more bitter. As a result giraffes start to eat an acacia's folliage from the downwind side.